<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">

<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>Div闪烁</title>
    <style type="text/css">
    #box {
        position: absolute;
        top: 50%;
        left: 50%;
        color: #fff;
        width: 200px;
        height: 200px;
        background: red;
        cursor: pointer;
        letter-spacing: 5px;
        text-align: center;
        font: 12px/200px Arial;
        margin: -100px 0 0 -100px;
    }
    </style>
    <script type="text/javascript">
    window.onload = function() {
        var oBox = document.getElementById("box");
        var timer = null;

        oBox.onclick = function() {
            var i = 0;
            clearInterval(timer);
            timer = setInterval(function() {
                oBox.style.display = i++ % 2 ? "none" : "block";
                i > 6 && (clearInterval(timer))
            }, 80)
        }
    };
    </script>
</head>

<body>
    <div id="box">点击我就闪</div>
</body>

</html>
